How do I redirect users to the login page when a session has timed out in Blazor?
To redirect users to your login page when their session has expired, create a RedirectLogin Razor component and implement the AuthenticationState to check whether sessions are expired or valid.Follow these steps to redirect to a login page when sessions time out in Blazor: Create a RedirectLogin component to redirect users to a login page when their session has expired. [RedirectLogin.razor] Now, initialize the RedirectLogin component in App.razor to identify whether a session is expired or valid. [App.razor] View Sample in GitHub
How do I redirect a page to the login if the user is not authenticated in Blazor WebAssembly?
To redirect to the login page when a user is not authenticated in Blazor WebAssembly: Create a login page component. Add the login page component to the NotAuthorized tag. Follow these steps to redirect to the login page if the user is not authenticated: Create a login page component for redirection.[LoginRedirect.razor] @inject NavigationManager UriHelper@code { protected override void OnInitialized() { UriHelper.NavigateTo(“login”); } } Now add the LoginRedirect component to the NotAuthorized tag to redirect to the login page if the user is not authorized.[App.razor] <Router AppAssembly=”@typeof(Program).Assembly” PreferExactMatches=”@true”> <Found Context=”routeData”> <AuthorizeRouteView RouteData=”@routeData” DefaultLayout=”@typeof(MainLayout)”> <NotAuthorized> <LoginRedirect /> </NotAuthorized> </AuthorizeRouteView> </Found> <NotFound> <LayoutView Layout=”@typeof(MainLayout)”> <p>Sorry, there’s nothing at this address.</p> </LayoutView> </NotFound> </Router> Refer to this documentation for more details. View Sample in GitHub
How do I get a browser’s culture in Blazor WebAssembly?
To get a browser’s culture in Blazor WebAssembly, call the (navigator.language) property in JavaScript using the JavaScript interop function in Blazor. It will return the current browser’s language version. Follow this code to get the browser’s culture in Blazor WebAssembly. [Index.razor] [index.html]
How do I display a server’s date and time on a Blazor component?
Use the DateTime.Now property to display the server’s date and time in a Blazor component. Follow this code snippet to do this. [Index.razor] Refer to this documentation for more details.
How do you convert the date and time to a client’s or user’s time zone in Blazor Server?
To convert the date and time to a client’s or user’s time zone in Blazor Server, use the JavaScript function to get the current offset time difference from UTC in minutes using the GetLocalDateTime() method in Blazor using JavaScript Interop. Display the local time by the current offset time difference. Follow these steps to convert the server time zone to the user’s time zone. To define the TimeZoneService class and the GetLocalDateTime() method, create a new file named TimeZoneService.cs in your project. Inside the TimeZoneService.cs file, define the TimeZoneService class and implement the GetLocalDateTime() method. using Microsoft.JSInterop;namespace BlazorServerApp{ public class TimeZoneService { private readonly IJSRuntime _jsRuntime; private TimeSpan? _userOffset; public TimeZoneService ( IJSRuntime jsRuntime ) { _jsRuntime = jsRuntime; } public async ValueTask GetLocalDateTime ( DateTimeOffset dateTime ) { if (_userOffset == null) { int offsetInMinutes = await _jsRuntime.InvokeAsync(“blazorGetTimezoneOffset”); _userOffset = TimeSpan.FromMinutes(-offsetInMinutes); } return dateTime.ToOffset(_userOffset.Value); } }} To register the time zone service, add the following code snippet to the Program.cs file.[Program.cs] builder.Services.AddScoped(); Create a JavaScript file named BlazorInterop.js within the wwwroot directory and include the provided code snippet in it.[BlazorInterop.js] function blazorGetTimezoneOffset() { return new Date().getTimezoneOffset();} To add a reference to the JavaScript file, open the Pages/_Layout.cshtml or _Host.cshtml file, and include the following line of code:[_Layout.cshtml/_Host.cshtml] <script src=”~/BlazorInterop.js”> Finally, you can utilize the service to display a date and time in your application.[Index.razor] @page “/” @inject TimeZoneService TimeZoneService <h1>Current date and time</h1> <p>Now (UTC): @DateTimeOffset.UtcNow.ToString()</p><p>Now (local): @localTime.ToString()</p> @code { DateTimeOffset localTime; protected override async Task OnAfterRenderAsync ( bool firstRender ) { if (firstRender) { // TODO: Require server render mode while instantiating the component to execute JavaScript in OnInitializedAsync. // In _Host.cshtml: localTime = await TimeZoneService.GetLocalDateTime(DateTimeOffset.UtcNow); } }} Refer to this link for more details. View Sample in GitHub